powerpc/bootwrapper: Allow user to specify additional default targets

It is inconvenient to add additional default targets to the bootwrapper
Makefile for each new board supported which just needs a different dts
file.  This change allows the defconfig to specify additional build
targets.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index f2a0f50146e1..3216a3a98396 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -458,6 +458,19 @@ config CMDLINE
           some command-line options at build time by entering them here.  In
           most cases you will need to specify the root device here.
 
+config EXTRA_TARGETS
+        string "Additional default image types"
+        help
+          List additional targets to be built by the bootwrapper here (separated
+          by spaces).  This is useful for targets that depend of device tree
+          files in the .dts directory.
+
+          Targets in this list will be build as part of the default build
+          target, or when the user does a 'make zImage' or a
+          'make zImage.initrd'.
+
+          If unsure, leave blank
+
 if !44x || BROKEN
 config ARCH_WANTS_FREEZER_CONTROL
         def_bool y
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index df6e62116e37..88d30dbed7b7 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -276,6 +276,9 @@ ifeq ($(CONFIG_PPC32),y)
 image-$(CONFIG_PPC_PMAC)        += zImage.coff zImage.miboot
 endif
 
+# Allow extra targets to be added to the defconfig
+image-y += $(subst ",,$(CONFIG_EXTRA_TARGETS))
+
 initrd-  := $(patsubst zImage%, zImage.initrd%, $(image-n) $(image-))
 initrd-y := $(patsubst zImage%, zImage.initrd%, \
                 $(patsubst dtbImage%, dtbImage.initrd%, \